diff --git a/crates/tauri/src/test/mock_runtime.rs b/crates/tauri/src/test/mock_runtime.rs
index 3c74e6870..3ad291f3c 100644
--- a/crates/tauri/src/test/mock_runtime.rs
+++ b/crates/tauri/src/test/mock_runtime.rs
@@ -1159,6 +1159,7 @@ impl<T: UserEvent> Runtime<T> for MockRuntime {
   type EventLoopProxy = EventProxy;
   type PlatformSpecificWebviewAttribute = ();
   type PlatformSpecificInitAttribute = ();
+  type WindowOpener = ();
 
   fn new(_args: RuntimeInitArgs<()>) -> Result<Self> {
     Ok(Self::init())